Biden's Iran nuclear deal obstacles extend beyond Tehran

President Joe Biden's administration has been sounding more optimistic as it works to clear the final hurdles to revive the 2015 nuclear deal with Iran. But before that can be fully achieved, the White House must first navigate the US Congress. Frustration over the continuing talks in Vienna has come from both sides of the aisle in Washington, where questions around legislative approval of the deal persist.

A scenario where the Vienna negotiations produce a nuclear deal that Congress alone blocks is technically possible but “very unlikely”, said Jonathan Lord, a senior fellow and director of the Middle East Security Programme at the Centre for a New American Security.

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